drivers/rtc/rtc-generic.c

   1 /* rtc-generic: RTC driver using the generic RTC abstraction
   2  *
   3  * Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca>
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/time.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/rtc.h>
  11
  12 #include <asm/rtc.h>
  13
  14 static int generic_get_time(struct device *dev, struct rtc_time *tm)
  15 {
  16         unsigned int ret = get_rtc_time(tm);
  17
  18         if (ret & RTC_BATT_BAD)
  19                 return -EOPNOTSUPP;
  20
  21         return rtc_valid_tm(tm);
  22 }
  23
  24 static int generic_set_time(struct device *dev, struct rtc_time *tm)
  25 {
  26         if (set_rtc_time(tm) < 0)
  27                 return -EOPNOTSUPP;
  28
  29         return 0;
  30 }
  31
  32 static const struct rtc_class_ops generic_rtc_ops = {
  33         .read_time = generic_get_time,
  34         .set_time = generic_set_time,
  35 };
  36
  37 static int __init generic_rtc_probe(struct platform_device *dev)
  38 {
  39         struct rtc_device *rtc;
  40
  41         rtc = rtc_device_register("rtc-generic", &dev->dev, &generic_rtc_ops,
  42                                   THIS_MODULE);
  43         if (IS_ERR(rtc))
  44                 return PTR_ERR(rtc);
  45
  46         platform_set_drvdata(dev, rtc);
  47
  48         return 0;
  49 }
  50
  51 static int __exit generic_rtc_remove(struct platform_device *dev)
  52 {
  53         struct rtc_device *rtc = platform_get_drvdata(dev);
  54
  55         rtc_device_unregister(rtc);
  56
  57         return 0;
  58 }
  59
  60 static struct platform_driver generic_rtc_driver = {
  61         .driver = {
  62                 .name = "rtc-generic",
  63                 .owner = THIS_MODULE,
  64         },
  65         .remove = __exit_p(generic_rtc_remove),
  66 };
  67
  68 static int __init generic_rtc_init(void)
  69 {
  70         return platform_driver_probe(&generic_rtc_driver, generic_rtc_probe);
  71 }
  72
  73 static void __exit generic_rtc_fini(void)
  74 {
  75         platform_driver_unregister(&generic_rtc_driver);
  76 }
  77
  78 module_init(generic_rtc_init);
  79 module_exit(generic_rtc_fini);
  80
  81 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
  82 MODULE_LICENSE("GPL");
  83 MODULE_DESCRIPTION("Generic RTC driver");
  84 MODULE_ALIAS("platform:rtc-generic");